wayland: Refactor MetaWaylandSurfaceRoleCursor

Move into a standalone meta-wayland-surface-role-cursor.[ch], and
make generic enough to work for pointe and additional (eg. tablet)
cursors.

Most notably, the sprite is now kept completely internal to the
cursor role, and updates are routed through the given
MetaCursorRenderer (which may be the default one for the pointer,
or something else).

The way cursor updates after cursor surface destruction has also
been reworked, the pointer will just keep track of the last cursor
surface, so older surfaces being destroyed don't trigger pointer
rechecks/updates.

src/Makefile.am

@@ -296,6 +296,8 @@ libmutter_la_SOURCES +=				\
 	wayland/meta-wayland-touch.h		\
 	wayland/meta-wayland-surface.c		\
 	wayland/meta-wayland-surface.h		\
+	wayland/meta-wayland-surface-role-cursor.c	\
+	wayland/meta-wayland-surface-role-cursor.h	\
 	wayland/meta-wayland-types.h		\
 	wayland/meta-wayland-versions.h		\
 	wayland/meta-wayland-outputs.c		\

src/wayland/meta-wayland-pointer.c

@@ -54,6 +54,7 @@
 #include "meta-wayland-private.h"
 #include "meta-wayland-surface.h"
 #include "meta-wayland-buffer.h"
+#include "meta-wayland-surface-role-cursor.h"
 #include "meta-xwayland.h"
 #include "meta-cursor.h"
 #include "meta-cursor-tracker-private.h"
@@ -73,24 +74,6 @@
 
 #define DEFAULT_AXIS_STEP_DISTANCE wl_fixed_from_int (10)
 
-struct _MetaWaylandSurfaceRoleCursor
-{
-  MetaWaylandSurfaceRole parent;
-
-  int hot_x;
-  int hot_y;
-  MetaCursorSprite *cursor_sprite;
-
-  MetaWaylandBuffer *buffer;
-};
-
-G_DEFINE_TYPE (MetaWaylandSurfaceRoleCursor,
-               meta_wayland_surface_role_cursor,
-               META_TYPE_WAYLAND_SURFACE_ROLE);
-
-static void
-meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer);
-
 static MetaWaylandPointerClient *
 meta_wayland_pointer_client_new (void)
 {
@@ -501,6 +484,12 @@ meta_wayland_pointer_release (MetaWaylandPointer *pointer)
                                         (gpointer) meta_wayland_pointer_on_cursor_changed,
                                         pointer);
 
+  if (pointer->cursor_surface && pointer->cursor_surface_destroy_id)
+    {
+      g_signal_handler_disconnect (pointer->cursor_surface,
+                                   pointer->cursor_surface_destroy_id);
+    }
+
   meta_wayland_pointer_set_focus (pointer, NULL);
 
   g_clear_pointer (&pointer->pointer_clients, g_hash_table_unref);
@@ -928,7 +917,7 @@ meta_wayland_pointer_get_relative_coordinates (MetaWaylandPointer *pointer,
   *sy = wl_fixed_from_double (yf);
 }
 
-static void
+void
 meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer)
 {
   MetaCursorTracker *cursor_tracker = meta_cursor_tracker_get_for_screen (NULL);
@@ -942,7 +931,7 @@ meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer)
           MetaWaylandSurfaceRoleCursor *cursor_role =
             META_WAYLAND_SURFACE_ROLE_CURSOR (pointer->cursor_surface->role);
 
-          cursor_sprite = cursor_role->cursor_sprite;
+          cursor_sprite = meta_wayland_surface_role_cursor_get_sprite (cursor_role);
         }
 
       meta_cursor_tracker_set_window_cursor (cursor_tracker, cursor_sprite);
@@ -954,68 +943,14 @@ meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer)
 }
 
 static void
-update_cursor_sprite_texture (MetaWaylandSurface *surface)
+ensure_update_cursor_surface (MetaWaylandPointer *pointer,
+                              MetaWaylandSurface *surface)
 {
-  MetaCursorRenderer *cursor_renderer =
+  if (pointer->cursor_surface != surface)
-    meta_backend_get_cursor_renderer (meta_get_backend ());
+    return;
-  MetaCursorTracker *cursor_tracker = meta_cursor_tracker_get_for_screen (NULL);
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (surface->role);
-  MetaCursorSprite *cursor_sprite = cursor_role->cursor_sprite;
-  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
 
-  g_return_if_fail (!buffer || buffer->texture);
+  pointer->cursor_surface = NULL;
-
+  meta_wayland_pointer_update_cursor_surface (pointer);
-  if (buffer)
-    {
-      meta_cursor_sprite_set_texture (cursor_sprite,
-                                      buffer->texture,
-                                      cursor_role->hot_x * surface->scale,
-                                      cursor_role->hot_y * surface->scale);
-
-      if (cursor_role->buffer)
-        {
-          struct wl_resource *buffer_resource;
-
-          g_assert (cursor_role->buffer == buffer);
-          buffer_resource = buffer->resource;
-          meta_cursor_renderer_realize_cursor_from_wl_buffer (cursor_renderer,
-                                                              cursor_sprite,
-                                                              buffer_resource);
-
-          meta_wayland_surface_unref_buffer_use_count (surface);
-          g_clear_object (&cursor_role->buffer);
-        }
-    }
-  else
-    {
-      meta_cursor_sprite_set_texture (cursor_sprite, NULL, 0, 0);
-    }
-
-  if (cursor_sprite == meta_cursor_tracker_get_displayed_cursor (cursor_tracker))
-    meta_cursor_renderer_force_update (cursor_renderer);
-}
-
-static void
-cursor_sprite_prepare_at (MetaCursorSprite *cursor_sprite,
-                          int x,
-                          int y,
-                          MetaWaylandSurfaceRoleCursor *cursor_role)
-{
-  MetaWaylandSurfaceRole *role = META_WAYLAND_SURFACE_ROLE (cursor_role);
-  MetaWaylandSurface *surface = meta_wayland_surface_role_get_surface (role);
-  MetaDisplay *display = meta_get_display ();
-  MetaScreen *screen = display->screen;
-  const MetaMonitorInfo *monitor;
-
-  if (!meta_xwayland_is_xwayland_surface (surface))
-    {
-      monitor = meta_screen_get_monitor_for_point (screen, x, y);
-      if (monitor)
-        meta_cursor_sprite_set_texture_scale (cursor_sprite,
-                                              (float)monitor->scale / surface->scale);
-    }
-  meta_wayland_surface_update_outputs (surface);
 }
 
 static void
@@ -1025,14 +960,28 @@ meta_wayland_pointer_set_cursor_surface (MetaWaylandPointer *pointer,
   MetaWaylandSurface *prev_cursor_surface;
 
   prev_cursor_surface = pointer->cursor_surface;
+
+  if (prev_cursor_surface == cursor_surface)
+    return;
+
   pointer->cursor_surface = cursor_surface;
 
-  if (prev_cursor_surface != cursor_surface)
-    {
   if (prev_cursor_surface)
+    {
       meta_wayland_surface_update_outputs (prev_cursor_surface);
-      meta_wayland_pointer_update_cursor_surface (pointer);
+      g_signal_handler_disconnect (prev_cursor_surface,
+                                   pointer->cursor_surface_destroy_id);
     }
+
+  if (cursor_surface)
+    {
+      pointer->cursor_surface_destroy_id =
+        g_signal_connect_swapped (cursor_surface, "destroy",
+                                  G_CALLBACK (ensure_update_cursor_surface),
+                                  pointer);
+    }
+
+  meta_wayland_pointer_update_cursor_surface (pointer);
 }
 
 static void
@@ -1066,23 +1015,15 @@ pointer_set_cursor (struct wl_client *client,
 
   if (surface)
     {
+      MetaCursorRenderer *cursor_renderer =
+        meta_backend_get_cursor_renderer (meta_get_backend ());
       MetaWaylandSurfaceRoleCursor *cursor_role;
 
       cursor_role = META_WAYLAND_SURFACE_ROLE_CURSOR (surface->role);
-      if (!cursor_role->cursor_sprite)
+      meta_wayland_surface_role_cursor_set_renderer (cursor_role,
-        {
+                                                     cursor_renderer);
-          cursor_role->cursor_sprite = meta_cursor_sprite_new ();
+      meta_wayland_surface_role_cursor_set_hotspot (cursor_role,
-          g_signal_connect_object (cursor_role->cursor_sprite,
+                                                    hot_x, hot_y);
-                                   "prepare-at",
-                                   G_CALLBACK (cursor_sprite_prepare_at),
-                                   cursor_role,
-                                   0);
-        }
-
-      cursor_role->hot_x = hot_x;
-      cursor_role->hot_y = hot_y;
-
-      update_cursor_sprite_texture (surface);
     }
 
   meta_wayland_pointer_set_cursor_surface (pointer, surface);
@@ -1255,136 +1196,3 @@ meta_wayland_pointer_get_seat (MetaWaylandPointer *pointer)
   MetaWaylandSeat *seat = wl_container_of (pointer, seat, pointer);
   return seat;
 }
-
-static void
-cursor_surface_role_assigned (MetaWaylandSurfaceRole *surface_role)
-{
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
-  MetaWaylandSurface *surface =
-    meta_wayland_surface_role_get_surface (surface_role);
-  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
-
-  if (buffer)
-    {
-      g_set_object (&cursor_role->buffer, buffer);
-      meta_wayland_surface_ref_buffer_use_count (surface);
-    }
-
-  meta_wayland_surface_queue_pending_frame_callbacks (surface);
-}
-
-static void
-cursor_surface_role_pre_commit (MetaWaylandSurfaceRole  *surface_role,
-                                MetaWaylandPendingState *pending)
-{
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
-  MetaWaylandSurface *surface =
-    meta_wayland_surface_role_get_surface (surface_role);
-
-  if (pending->newly_attached && cursor_role->buffer)
-    {
-      meta_wayland_surface_unref_buffer_use_count (surface);
-      g_clear_object (&cursor_role->buffer);
-    }
-}
-
-static void
-cursor_surface_role_commit (MetaWaylandSurfaceRole  *surface_role,
-                            MetaWaylandPendingState *pending)
-{
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
-  MetaWaylandSurface *surface =
-    meta_wayland_surface_role_get_surface (surface_role);
-  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
-
-  if (pending->newly_attached)
-    {
-      g_set_object (&cursor_role->buffer, buffer);
-      if (cursor_role->buffer)
-        meta_wayland_surface_ref_buffer_use_count (surface);
-    }
-
-  meta_wayland_surface_queue_pending_state_frame_callbacks (surface, pending);
-
-  if (pending->newly_attached)
-    update_cursor_sprite_texture (surface);
-}
-
-static gboolean
-cursor_surface_role_is_on_output (MetaWaylandSurfaceRole *role,
-                                  MetaMonitorInfo        *monitor)
-{
-  MetaWaylandSurface *surface =
-    meta_wayland_surface_role_get_surface (role);
-  MetaWaylandPointer *pointer = &surface->compositor->seat->pointer;
-  MetaCursorTracker *cursor_tracker = meta_cursor_tracker_get_for_screen (NULL);
-  MetaCursorRenderer *cursor_renderer =
-    meta_backend_get_cursor_renderer (meta_get_backend ());
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (surface->role);
-  MetaCursorSprite *displayed_cursor_sprite;
-  MetaRectangle rect;
-
-  if (surface != pointer->cursor_surface)
-    return FALSE;
-
-  displayed_cursor_sprite =
-    meta_cursor_tracker_get_displayed_cursor (cursor_tracker);
-  if (!displayed_cursor_sprite)
-    return FALSE;
-
-  if (cursor_role->cursor_sprite != displayed_cursor_sprite)
-    return FALSE;
-
-  rect = meta_cursor_renderer_calculate_rect (cursor_renderer,
-                                              cursor_role->cursor_sprite);
-  return meta_rectangle_overlap (&rect, &monitor->rect);
-}
-
-static void
-cursor_surface_role_dispose (GObject *object)
-{
-  MetaWaylandSurfaceRoleCursor *cursor_role =
-    META_WAYLAND_SURFACE_ROLE_CURSOR (object);
-  MetaWaylandSurface *surface =
-    meta_wayland_surface_role_get_surface (META_WAYLAND_SURFACE_ROLE (object));
-  MetaWaylandCompositor *compositor = meta_wayland_compositor_get_default ();
-  MetaWaylandPointer *pointer = &compositor->seat->pointer;
-
-  if (pointer->cursor_surface == surface)
-    pointer->cursor_surface = NULL;
-  meta_wayland_pointer_update_cursor_surface (pointer);
-
-  g_clear_object (&cursor_role->cursor_sprite);
-
-  if (cursor_role->buffer)
-    {
-      meta_wayland_surface_unref_buffer_use_count (surface);
-      g_clear_object (&cursor_role->buffer);
-    }
-
-  G_OBJECT_CLASS (meta_wayland_surface_role_cursor_parent_class)->dispose (object);
-}
-
-static void
-meta_wayland_surface_role_cursor_init (MetaWaylandSurfaceRoleCursor *role)
-{
-}
-
-static void
-meta_wayland_surface_role_cursor_class_init (MetaWaylandSurfaceRoleCursorClass *klass)
-{
-  MetaWaylandSurfaceRoleClass *surface_role_class =
-    META_WAYLAND_SURFACE_ROLE_CLASS (klass);
-  GObjectClass *object_class = G_OBJECT_CLASS (klass);
-
-  surface_role_class->assigned = cursor_surface_role_assigned;
-  surface_role_class->pre_commit = cursor_surface_role_pre_commit;
-  surface_role_class->commit = cursor_surface_role_commit;
-  surface_role_class->is_on_output = cursor_surface_role_is_on_output;
-
-  object_class->dispose = cursor_surface_role_dispose;
-}

src/wayland/meta-wayland-pointer.h

@@ -32,12 +32,6 @@
 
 #include <meta/meta-cursor-tracker.h>
 
-#define META_TYPE_WAYLAND_SURFACE_ROLE_CURSOR (meta_wayland_surface_role_cursor_get_type ())
-G_DECLARE_FINAL_TYPE (MetaWaylandSurfaceRoleCursor,
-                      meta_wayland_surface_role_cursor,
-                      META, WAYLAND_SURFACE_ROLE_CURSOR,
-                      MetaWaylandSurfaceRole);
-
 struct _MetaWaylandPointerGrabInterface
 {
   void (*focus) (MetaWaylandPointerGrab *grab,
@@ -75,6 +69,7 @@ struct _MetaWaylandPointer
   guint32 click_serial;
 
   MetaWaylandSurface *cursor_surface;
+  guint cursor_surface_destroy_id;
 
   MetaWaylandPointerGrab *grab;
   MetaWaylandPointerGrab default_grab;
@@ -151,4 +146,8 @@ void meta_wayland_relative_pointer_init (MetaWaylandCompositor *compositor);
 
 MetaWaylandSeat *meta_wayland_pointer_get_seat (MetaWaylandPointer *pointer);
 
+void meta_wayland_surface_cursor_update (MetaWaylandSurface *cursor_surface);
+
+void meta_wayland_pointer_update_cursor_surface (MetaWaylandPointer *pointer);
+
 #endif /* META_WAYLAND_POINTER_H */

src/wayland/meta-wayland-surface-role-cursor.c

@@ -0,0 +1,281 @@
+/*
+ * Wayland Support
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include <cogl/cogl.h>
+#include <cogl/cogl-wayland-server.h>
+#include "meta-wayland-surface-role-cursor.h"
+#include "meta-wayland-buffer.h"
+#include "meta-xwayland.h"
+#include "screen-private.h"
+
+struct _MetaWaylandSurfaceRoleCursor
+{
+  MetaWaylandSurfaceRole parent;
+
+  int hot_x;
+  int hot_y;
+  MetaCursorSprite *cursor_sprite;
+  MetaCursorRenderer *cursor_renderer;
+  MetaWaylandBuffer *buffer;
+};
+
+G_DEFINE_TYPE (MetaWaylandSurfaceRoleCursor,
+               meta_wayland_surface_role_cursor,
+               META_TYPE_WAYLAND_SURFACE_ROLE)
+
+static void
+update_cursor_sprite_texture (MetaWaylandSurfaceRoleCursor *cursor_role)
+{
+  MetaWaylandSurface *surface = meta_wayland_surface_role_get_surface (META_WAYLAND_SURFACE_ROLE (cursor_role));
+  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
+  MetaCursorSprite *cursor_sprite = cursor_role->cursor_sprite;
+
+  g_return_if_fail (!buffer || buffer->texture);
+
+  if (!cursor_role->cursor_renderer || !cursor_sprite)
+    return;
+
+  if (buffer)
+    {
+      meta_cursor_sprite_set_texture (cursor_sprite,
+                                      buffer->texture,
+                                      cursor_role->hot_x * surface->scale,
+                                      cursor_role->hot_y * surface->scale);
+
+      if (cursor_role->buffer)
+        {
+          struct wl_resource *buffer_resource;
+
+          g_assert (cursor_role->buffer == buffer);
+          buffer_resource = buffer->resource;
+          meta_cursor_renderer_realize_cursor_from_wl_buffer (cursor_role->cursor_renderer,
+                                                              cursor_sprite,
+                                                              buffer_resource);
+
+          meta_wayland_surface_unref_buffer_use_count (surface);
+          g_clear_object (&cursor_role->buffer);
+        }
+    }
+  else
+    {
+      meta_cursor_sprite_set_texture (cursor_sprite, NULL, 0, 0);
+    }
+
+  meta_cursor_renderer_force_update (cursor_role->cursor_renderer);
+}
+
+static void
+cursor_sprite_prepare_at (MetaCursorSprite             *cursor_sprite,
+                          int                           x,
+                          int                           y,
+                          MetaWaylandSurfaceRoleCursor *cursor_role)
+{
+  MetaWaylandSurfaceRole *role = META_WAYLAND_SURFACE_ROLE (cursor_role);
+  MetaWaylandSurface *surface = meta_wayland_surface_role_get_surface (role);
+  MetaDisplay *display = meta_get_display ();
+  MetaScreen *screen = display->screen;
+  const MetaMonitorInfo *monitor;
+
+  if (!meta_xwayland_is_xwayland_surface (surface))
+    {
+      monitor = meta_screen_get_monitor_for_point (screen, x, y);
+      if (monitor)
+        meta_cursor_sprite_set_texture_scale (cursor_sprite,
+                                              (float) monitor->scale / surface->scale);
+    }
+  meta_wayland_surface_update_outputs (surface);
+}
+
+static void
+cursor_surface_role_assigned (MetaWaylandSurfaceRole *surface_role)
+{
+  MetaWaylandSurfaceRoleCursor *cursor_role =
+    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
+  MetaWaylandSurface *surface =
+    meta_wayland_surface_role_get_surface (surface_role);
+  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
+
+  if (buffer)
+    {
+      g_set_object (&cursor_role->buffer, buffer);
+      meta_wayland_surface_ref_buffer_use_count (surface);
+    }
+
+  meta_wayland_surface_queue_pending_frame_callbacks (surface);
+}
+
+static void
+cursor_surface_role_pre_commit (MetaWaylandSurfaceRole  *surface_role,
+                                MetaWaylandPendingState *pending)
+{
+  MetaWaylandSurfaceRoleCursor *cursor_role =
+    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
+  MetaWaylandSurface *surface =
+    meta_wayland_surface_role_get_surface (surface_role);
+
+  if (pending->newly_attached && cursor_role->buffer)
+    {
+      meta_wayland_surface_unref_buffer_use_count (surface);
+      g_clear_object (&cursor_role->buffer);
+    }
+}
+
+static void
+cursor_surface_role_commit (MetaWaylandSurfaceRole  *surface_role,
+                            MetaWaylandPendingState *pending)
+{
+  MetaWaylandSurfaceRoleCursor *cursor_role =
+    META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role);
+  MetaWaylandSurface *surface =
+    meta_wayland_surface_role_get_surface (surface_role);
+  MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
+
+  if (pending->newly_attached)
+    {
+      g_set_object (&cursor_role->buffer, buffer);
+      if (cursor_role->buffer)
+        meta_wayland_surface_ref_buffer_use_count (surface);
+    }
+
+  meta_wayland_surface_queue_pending_state_frame_callbacks (surface, pending);
+
+  if (pending->newly_attached)
+    update_cursor_sprite_texture (META_WAYLAND_SURFACE_ROLE_CURSOR (surface_role));
+}
+
+static gboolean
+cursor_surface_role_is_on_output (MetaWaylandSurfaceRole *role,
+                                  MetaMonitorInfo        *monitor)
+{
+  MetaWaylandSurface *surface =
+    meta_wayland_surface_role_get_surface (role);
+  MetaWaylandSurfaceRoleCursor *cursor_role =
+    META_WAYLAND_SURFACE_ROLE_CURSOR (surface->role);
+  MetaRectangle rect;
+
+  rect = meta_cursor_renderer_calculate_rect (cursor_role->cursor_renderer,
+                                              cursor_role->cursor_sprite);
+  return meta_rectangle_overlap (&rect, &monitor->rect);
+}
+
+static void
+cursor_surface_role_dispose (GObject *object)
+{
+  MetaWaylandSurfaceRoleCursor *cursor_role =
+    META_WAYLAND_SURFACE_ROLE_CURSOR (object);
+  MetaWaylandSurface *surface =
+    meta_wayland_surface_role_get_surface (META_WAYLAND_SURFACE_ROLE (object));
+
+  g_signal_handlers_disconnect_by_func (cursor_role->cursor_sprite,
+                                        cursor_sprite_prepare_at, cursor_role);
+
+  g_clear_object (&cursor_role->cursor_renderer);
+  g_clear_object (&cursor_role->cursor_sprite);
+
+  if (cursor_role->buffer)
+    {
+      meta_wayland_surface_unref_buffer_use_count (surface);
+      g_clear_object (&cursor_role->buffer);
+    }
+
+  G_OBJECT_CLASS (meta_wayland_surface_role_cursor_parent_class)->dispose (object);
+}
+
+static void
+meta_wayland_surface_role_cursor_init (MetaWaylandSurfaceRoleCursor *role)
+{
+  role->cursor_sprite = meta_cursor_sprite_new ();
+  g_signal_connect_object (role->cursor_sprite,
+                           "prepare-at",
+                           G_CALLBACK (cursor_sprite_prepare_at),
+                           role,
+                           0);
+}
+
+static void
+meta_wayland_surface_role_cursor_class_init (MetaWaylandSurfaceRoleCursorClass *klass)
+{
+  MetaWaylandSurfaceRoleClass *surface_role_class =
+    META_WAYLAND_SURFACE_ROLE_CLASS (klass);
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  surface_role_class->assigned = cursor_surface_role_assigned;
+  surface_role_class->pre_commit = cursor_surface_role_pre_commit;
+  surface_role_class->commit = cursor_surface_role_commit;
+  surface_role_class->is_on_output = cursor_surface_role_is_on_output;
+
+  object_class->dispose = cursor_surface_role_dispose;
+}
+
+MetaCursorSprite *
+meta_wayland_surface_role_cursor_get_sprite (MetaWaylandSurfaceRoleCursor *cursor_role)
+{
+  return cursor_role->cursor_sprite;
+}
+
+void
+meta_wayland_surface_role_cursor_set_hotspot (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                              gint                          hotspot_x,
+                                              gint                          hotspot_y)
+{
+  if (cursor_role->hot_x == hotspot_x &&
+      cursor_role->hot_y == hotspot_y)
+    return;
+
+  cursor_role->hot_x = hotspot_x;
+  cursor_role->hot_y = hotspot_y;
+  update_cursor_sprite_texture (cursor_role);
+}
+
+void
+meta_wayland_surface_role_cursor_get_hotspot (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                              gint                         *hotspot_x,
+                                              gint                         *hotspot_y)
+{
+  if (hotspot_x)
+    *hotspot_x = cursor_role->hot_x;
+  if (hotspot_y)
+    *hotspot_y = cursor_role->hot_y;
+}
+
+void
+meta_wayland_surface_role_cursor_set_renderer (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                               MetaCursorRenderer           *renderer)
+{
+  if (cursor_role->cursor_renderer == renderer)
+    return;
+
+  if (renderer)
+    g_object_ref (renderer);
+  if (cursor_role->cursor_renderer)
+    g_object_unref (cursor_role->cursor_renderer);
+
+  cursor_role->cursor_renderer = renderer;
+  update_cursor_sprite_texture (cursor_role);
+}
+
+MetaCursorRenderer *
+meta_wayland_surface_role_cursor_get_renderer (MetaWaylandSurfaceRoleCursor *cursor_role)
+{
+  return cursor_role->cursor_renderer;
+}

src/wayland/meta-wayland-surface-role-cursor.h

@@ -0,0 +1,47 @@
+/*
+ * Wayland Support
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_WAYLAND_SURFACE_ROLE_CURSOR_H
+#define META_WAYLAND_SURFACE_ROLE_CURSOR_H
+
+#include "meta-wayland-surface.h"
+#include "backends/meta-cursor-renderer.h"
+
+#define META_TYPE_WAYLAND_SURFACE_ROLE_CURSOR (meta_wayland_surface_role_cursor_get_type ())
+G_DECLARE_FINAL_TYPE (MetaWaylandSurfaceRoleCursor,
+                      meta_wayland_surface_role_cursor,
+                      META, WAYLAND_SURFACE_ROLE_CURSOR,
+                      MetaWaylandSurfaceRole);
+
+MetaCursorSprite *   meta_wayland_surface_role_cursor_get_sprite   (MetaWaylandSurfaceRoleCursor *cursor_role);
+
+void                 meta_wayland_surface_role_cursor_set_hotspot  (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                                                    gint                          hotspot_x,
+                                                                    gint                          hotspot_y);
+void                 meta_wayland_surface_role_cursor_get_hotspot  (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                                                    gint                         *hotspot_x,
+                                                                    gint                         *hotspot_y);
+void                 meta_wayland_surface_role_cursor_set_renderer (MetaWaylandSurfaceRoleCursor *cursor_role,
+                                                                    MetaCursorRenderer           *renderer);
+MetaCursorRenderer * meta_wayland_surface_role_cursor_get_renderer (MetaWaylandSurfaceRoleCursor *cursor_role);
+
+
+#endif /* META_WAYLAND_SURFACE_ROLE_CURSOR_H */